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Added CALLBACK_SetupAt

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1080
This commit is contained in:
Ulf Wohlers 2003-07-05 14:05:05 +00:00
parent 42711fd855
commit 3b0f6bfda8
2 changed files with 30 additions and 0 deletions
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1
include/callback.h
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@ -47,6 +47,7 @@ void CALLBACK_RunRealInt(Bit8u intnum);
void CALLBACK_RunRealFar(Bit16u seg,Bit16u off);
bool CALLBACK_Setup(Bitu callback,CallBack_Handler handler,Bitu type);
bool CALLBACK_SetupAt(Bitu callback,CallBack_Handler handler,Bitu type,Bitu linearAddress);
bool CALLBACK_Free(Bitu callback);

29
src/cpu/callback.cpp
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@ -148,6 +148,35 @@ bool CALLBACK_Setup(Bitu callback,CallBack_Handler handler,Bitu type) {
return true;
}
bool CALLBACK_SetupAt(Bitu callback,CallBack_Handler handler,Bitu type,Bitu linearAddress) {
if (callback>=CB_MAX) return false;
switch (type) {
case CB_RETF:
mem_writeb(linearAddress+0,(Bit8u)0xFE); //GRP 4
mem_writeb(linearAddress+1,(Bit8u)0x38); //Extra Callback instruction
mem_writew(linearAddress+2, callback); //The immediate word
mem_writeb(linearAddress+4,(Bit8u)0xCB); //A RETF Instruction
break;
case CB_IRET:
mem_writeb(linearAddress+0,(Bit8u)0xFE); //GRP 4
mem_writeb(linearAddress+1,(Bit8u)0x38); //Extra Callback instruction
mem_writew(linearAddress+2,callback); //The immediate word
mem_writeb(linearAddress+4,(Bit8u)0xCF); //An IRET Instruction
break;
case CB_IRET_STI:
mem_writeb(linearAddress+0,(Bit8u)0xFB); //STI
mem_writeb(linearAddress+1,(Bit8u)0xFE); //GRP 4
mem_writeb(linearAddress+2,(Bit8u)0x38); //Extra Callback instruction
mem_writew(linearAddress+3, callback); //The immediate word
mem_writeb(linearAddress+5,(Bit8u)0xCF); //An IRET Instruction
break;
default:
E_Exit("CALLBACK:Setup:Illegal type %d",type);
}
CallBack_Handlers[callback]=handler;
return true;
}
void CALLBACK_Init(Section* sec) {
Bitu i;
for (i=0;i<CB_MAX;i++) {